20xx年中級(jí)通信工程師考試綜合業(yè)務(wù)能力真題及標(biāo)準(zhǔn)答案-資料下載頁
2025-06-28 06:34本頁面
【正文】 ators. From the wireless access networks belonging to different administrative domains, mobile users cannot always identify at every instance which network is the best one to access for their service. It is highly demanded to establish a network architecture which can facilitate mobile terminals to access the appropriate network in a costeffective way. If a mobile user wants to move from one network to another with continuous service, the terminals have to cope with network change to maintain service seamlessly. Quality of service is a major issue that the end users should be provided with the satisfying service, while the network workload and cost should not too much increased. In addition, since end users are provided with numerous service ranging from VoiceoverIP to VideoonDemand services, it is expected that users can experience the same quality for all the different service. Therefore, the network architecture need to be designed in such a way that the quality mechanism is incorporated so that users are served according to their individual QoS requirements. Based on the paragraph above, at present, seamless roaming over heterogenous wireless network is （A） in conventional cellular munication networks, Because of （A）, mobile users cannot always identify at every instance which network is the best one to access for their services. To satisfy the users QoS requirements, the network architecture design should include （B）. than than good as as good as different network administrative domains same network administrative domains and mobile users users same network administrative domains over –IP quality mechanism
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